I did Dopey and then followed it up with the Tink 10K and Half, and definitely was not the only one. I would have done the 5K too, but I didn't want to burn the extra vacation time to get out to California a day earlier. It was fun to see how many people had made the cross-country trek; most of the people I talked to weren't even local to WDW or DLR
As for the lack of combination medal at Tink, according to one rD source, they only want to have one 10K+13.1 combination on each coast. For Marathon Weekend you can run the exact same 10K and Half as the Glass Slipper Challenge, yet you won't get anything extra for it. From the chatter I heard, nobody seemed upset about that, but everybody was in a tizzy about the setup with Tink. I would be pretty surprised if they add a combination medal to Tink in the future (at least without changing the race distances)